Issue #11847 implement environment context xml

[janbartel]

Closes #11847

[sbordet]

@janbartel I just filed #11861.

I think this PR and #11861 are orthogonal, but just wanted to double-check that if either is implemented, it won't step on the toes of the other.

[janbartel]

@janbartel I just filed #11861.

I think this PR and #11861 are orthogonal, but just wanted to double-check that if either is implemented, it won't step on the toes of the other.

I think the 2 can co-exist. It's not mandatory to have a core.properties file that defines the location of a context xml file to apply to all core deployments. And if you do define one, it should be fine to apply it along with any other context xml file defined for the "core webapp" either inside or outside the archive.

[janbartel]

@gregw nudge

[gregw]

Looks good, but let's add one more feature to better support derived classes